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I can certainly see that a monoshock rear suspension would produce a more rigid feel as the wheel moves through its travel, but I seriously doubt (depending on the materials used) that it would weigh less than a two-shock system. Keep in mind that a monoshock has to do the work of two shocks, so it must be a beefier unit with a bigger spring (maybe a larger gas/oil reservoir too). The monoshock swingarm with all its linkage and adjustment pieces add to the weight of the rear suspension system.